ceph: handle SESSION_FORCE_RO message

mark session as readonly and wake up all cap waiters.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index b93c631c6c87..d0618e8412fd 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2143,6 +2143,21 @@ again:
                         ret = 1;
                 }
         } else {
+                int session_readonly = false;
+                if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
+                        struct ceph_mds_session *s = ci->i_auth_cap->session;
+                        spin_lock(&s->s_cap_lock);
+                        session_readonly = s->s_readonly;
+                        spin_unlock(&s->s_cap_lock);
+                }
+                if (session_readonly) {
+                        dout("get_cap_refs %p needed %s but mds%d readonly\n",
+                             inode, ceph_cap_string(need), ci->i_auth_cap->mds);
+                        *err = -EROFS;
+                        ret = 1;
+                        goto out_unlock;
+                }
+
                 dout("get_cap_refs %p have %s needed %s\n", inode,
                      ceph_cap_string(have), ceph_cap_string(need));
         }